10. Tap Thread Limits (JIS, DIN, ANSI) Intro Metric Threads (M, MF) Unit: mm Major Minor Major Minor Pitch Diameter Pitch Diameter Kind diameter diameter Kind diameter diameter SP Size of Class Upper Lower Tolerance Basic Size of Class Upper Lower Tolerance Basic tap Basic Basic Tolerance tap Basic Basic Tolerance Size Size (μm) + Tolerance Size Size (μm) + Tolerance (μm) + (μm) Size (μm) + (μm) Size cutting tap cutting tap P1 25 10 15 P1 25 10 15 ISO1 17 6 11 M1.6×0.2 ISO1 1.600 1.470 15 5 10 1.383 SL ISO2 28 17 11 ISO2 25 15 10 M1×0.25 G3 1.000 0.838 38 26 12 0.729 P1 25 10 15 forming tap cutting tap G4 51 38 13 P2 40 25 15 ISO1X 38 26 12 ISO1 20 7 13 PO ISO2X 51 38 13 ISO2 34 20 14 cutting tap cutting tap P1 25 10 15 M1.7×0.35 G4 1.700 1.473 51 38 13 1.321 forming tap M1×0.2 ISO1 1.000 0.870 15 5 10 0.783 G5 64 51 13 ISO2 25 15 10 G6 76 64 12 P1 25 10 15 ISO2X 64 51 13 ST ISO1 17 6 11 ISO3X 76 64 12 cutting tap ISO2 28 17 11 P1 25 10 15 M1.1×0.25 G3 1.100 0.938 38 26 12 0.829 M1.7×0.2 ISO1 1.700 1.570 15 5 10 1.483 forming tap G4 51 38 13 ISO2 25 15 10 ROLL ISO1X 38 26 12 P1 25 10 15 cutting tap ISO2X 51 38 13 P2 40 25 15 cutting tap cutting tap cutting tap P1 25 10 15 ISO1 20 7 13 M1.1×0.2 ISO1 1.100 0.970 15 5 10 0.883 ISO2 34 20 14 CARBIDE ISO2 25 15 10 M1.8×0.35 G4 1.800 1.573 51 38 13 1.421 forming tap P1 25 10 15 G5 64 51 13 M1.2×0.25 ISO1 1.200 1.038 17 6 11 0.929 G6 76 64 12 ISO2 28 17 11 ISO2X 64 51 13 LONG P1 25 10 15 ISO3X 76 64 12 cutting tap ISO1 15 5 10 P1 25 10 15 ISO2 25 15 10 M1.8×0.2 ISO1 1.800 1.670 15 5 10 1.583 M1.2×0.2 G3 1.200 1.070 38 26 12 0.983 ISO2 25 15 10 forming tap HAND G4 51 38 13 P1 25 10 15 TAPS ISO1X 38 26 12 P2 40 25 15 cutting tap ISO2X 51 38 13 P3 55 40 15 M2×0.4 2.000 1.740 1.567 cutting tap P1 25 10 15 ISO1 21 7 14 ISO1 18 6 12 ISO2 36 21 15 EG (STI) ISO2 30 18 12 ISO2X 51 36 15 G3 38 26 12 G4 51 38 13 M1.4×0.3 1.400 1.205 1.075 forming tap forming tap G4 51 38 13 G5 64 51 13 SPECIAL G5 64 51 13 M2×0.4 G6 2.000 1.740 76 64 12 1.567 THREADS, ISO2X 51 38 13 ISO2X 64 51 13 GAUGES ISO3X 64 51 13 ISO3X 76 64 12 cutting tap P1 25 10 15 P1 25 10 15 cutting tap M1.4×0.2 ISO1 1.400 1.270 15 5 10 1.183 P2 40 25 15 THREAD M2×0.25 2.000 1.838 1.729 ISO2 25 15 10 ISO1 18 6 12 MILLS P1 25 10 15 ISO2 30 18 12 cutting tap P2 40 25 15 P1 25 10 15 ISO1 20 7 13 P2 40 25 15 cutting tap DIES ISO2 34 20 14 P3 55 40 15 M1.6×0.35 G4 1.600 1.373 51 38 13 1.221 ISO1 23 8 15 forming tap G5 64 51 13 ISO2 38 23 15 M2.2×0.45 2.200 1.908 1.713 G6 76 64 12 ISO2X 53 38 15 CENTER ISO2X 64 51 13 G5 64 51 13 forming tap DRILLS ISO3X 76 64 12 G7 89 76 13 ISO2X 64 51 13 ISO3X 89 76 13 Technical info 662